CVE-2025-20150
📋 TL;DR
An unauthenticated remote attacker can enumerate valid LDAP usernames on vulnerable Cisco Nexus Dashboard systems by sending authentication requests. This affects organizations using Cisco Nexus Dashboard with LDAP authentication configured. The vulnerability allows attackers to identify valid user accounts without authentication.
💻 Affected Systems
- Cisco Nexus Dashboard
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers build a complete list of valid usernames for targeted credential attacks, password spraying, or social engineering campaigns against specific individuals.
Likely Case
Attackers enumerate some valid usernames and use them for targeted password attacks or to map organizational structure.
If Mitigated
Attackers cannot determine which usernames are valid, limiting their ability to target specific accounts.
🎯 Exploit Status
Exploitation requires sending LDAP authentication requests to the vulnerable endpoint; no authentication needed
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Cisco advisory for specific patched versions
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nd-unenum-2xFFh472
Restart Required: Yes
Instructions:
1. Review Cisco advisory for affected versions. 2. Download and apply the appropriate patch from Cisco. 3. Restart the Nexus Dashboard service or system as required. 4. Verify the patch is applied successfully.
🔧 Temporary Workarounds
Disable LDAP Authentication
allTemporarily disable LDAP authentication on Nexus Dashboard until patching is complete
Navigate to Nexus Dashboard Settings > Authentication > LDAP and disable
Network Access Control
allRestrict access to Nexus Dashboard LDAP endpoints using firewall rules
Configure firewall to allow LDAP access only from trusted sources
🧯 If You Can't Patch
- Implement network segmentation to restrict access to Nexus Dashboard LDAP endpoints
- Enable rate limiting on authentication endpoints to slow enumeration attempts
🔍 How to Verify
Check if Vulnerable:
Check if LDAP authentication is enabled on Nexus Dashboard and review version against Cisco advisoryCheck Version:
Check Nexus Dashboard web interface or CLI for version informationVerify Fix Applied:
Verify Nexus Dashboard version is updated to patched version and test LDAP authentication functionality📡 Detection & Monitoring
Log Indicators:
- Multiple failed LDAP authentication attempts from single source
- LDAP authentication requests with various usernames from same IP
Network Indicators:
- Unusual volume of LDAP authentication traffic
- LDAP requests from unexpected sources
SIEM Query:
source="nexus-dashboard" AND event_type="ldap_auth" AND result="failure" | stats count by src_ip, username